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CK-12 Foundation is a non-profit organization with a mission to

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collaborative model termed the FlexBook®, CK-12 intends to pioneer

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adaptive environment for learning, powered through the FlexBook

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The names “CK-12” and “CK12” and associated logos and the

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Except as otherwise noted, all CK-12 Content (including

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Complete terms can be found at http://www.ck12.org/terms.

Printed: February 28, 2012

AUTHORS

Kathryn Dirga, (KateD)

Lori Jordan, (LoriJ